Journal
NANO LETTERS
Volume 13, Issue 12, Pages 5873-5879Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl402662e
Keywords
Time-dependent density functional theory (TDDFT); localized swface plasmon resonance (LSPR); quantum plasmonics
Categories
Funding
- Robert A. Welch Foundation [C-1222]
- U.S. Army Research Laboratory and Office [W911NF-12-1-0407]
- NIH award NCRR [S10RR02950]
- IBM Shared University Research (SUR) Award in partnership with CISCO
- Qlogic
- Adaptive Computing
- U.S. NSF [DMS-1066045, DMR-1056168]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1056168] Funding Source: National Science Foundation
- Division Of Mathematical Sciences
- Direct For Mathematical & Physical Scien [1066045] Funding Source: National Science Foundation
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Quantum mechanical effects can significantly reduce the plasmon-induced field enhancements around nanoparticles. Here we present a quantum mechanical investigation of the plasmon resonances in a nanomatryushka, which is a concentric core-shell nanoparticle consisting of a solid metallic core encapsulated in a thin metallic shell. We compute the optical response using the time-dependent density functional theory and compare the results with predictions based on the classical electromagnetic theory. We find strong quantum mechanical effects for core-shell spacings below 5 A, a regime where both the absorption cross section and the local field enhancements differ significantly from the classical predictions. We also show that the workfunction of the metal is a crucial parameter determining the onset and magnitude of quantum effects. For metals with lower workfunctions such as aluminum, the quantum effects are found to be significantly more pronounced than for a noble metal such as gold.
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